I am looking for the internal resistance of the ADC pin of my nrf51822. I have looked at the Product Specifications (as well as the Reference Manual and other documents just in case...) but didn't manage to find it :( . I saw typical values for other boards (Pi, STM32, etc.) but I need the exact value in the case of my Nordic nrf51822 board since I need to compute a precise value based on this resistance.
Does anyone know where (or how) I can find (or determine) this value?
Thanks in advance.
Here's the impedances based on the different configurations:
Another colleague of mine has posted a in-depth answer regarding other factors to think about when using the ADC here: